Mounting for rock drills



April 28, 1925.

R. H WILHELM MOUNTING FOR ROCK DRILLS Filed March a, 1924 INVENTORRumflEIMbfie/m BY ms AT RNEY Patented 28, 1925.

UNITED STATES PATENT OFFICE.

RUSSELL H. VILHELM, OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RANDCOMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

:NIOUNTING FOR ROCK DRILLS.

Application filed March 6, 1924.

To all whom it may concern:

Be it known that l, BUssELL H. lVILHELM, a citizen of the United States,and a resident of Easto-n, county of Northampton, and State ofPennsylvania, have invented a certain Mounting for Rock Drills, of whichthe following is a specification, accompanied by drawings.

This invention relates to fluid actuated percussive machines, but moreparticularly to a mounting for a rock drill of the hand held type,whereby the forward end portion of the machine may be supported in a newand improved manner.

It is often desirable to mount a hand held rock drill so that horizontalholes may be conveniently drilled and the operator is not hampered bythe weight of the machine. These machines have been heretofore mountedin cradles, which are adapted to be moved back and forth inshells,usually by means of a manually operated feed screw. The handlesof these machines have been clamped to the cradles and the forward endportionsof the machines have been secured to the cradles by separateclamps.

These clamps however have been found to be objectionable for severalreasons. One objection has been that these clamps become loosened aftera comparatively short period of time due to the vibration set up in theoperation of the machine, and thereafter the machine is not securelyheld in place in the cradle, with the result that the efficient drillingof the machine is impaired. Another objection to these clamps has beentheir inability to withstand the hard knocks and usage to which thistype of machine is ordinarily subjected and. as a result breakage oftenoccurs. Furthermore, some rock drills do not provide sufficient space011 their forward end portions to enable a clamp to be secured thereto.7

One satisfactory manner of supporting the front end portion of a handheld rock drill may be obtained by forming a T- shaped projection on thefront head of the rock drill, which is guided in guide-ways formed on acradle. By this means, clamps which have been heretofore used, have beeneliminated and an efficient construction produced which is cheap tomanufacture, and by which the number of parts on the machine has beenreduced.

Serial No. 697,206.

Whenever the rock drill is detached from the mounting, this projectlonis still useful. Heretofore, whenever horizontal holes close to theground have been drilled by hand 1 must be replaced by a new one or thelugv will wear to such a point that the weight of the rock drill will besupported on the steel retainer with the added disadvantage of weakeningthis part. By means of an integrally formed projection; formed on the.

front head the machine may be used for drilling horizontal holes closeto the ground and guided and supported upon this proj ection so that thelife of the front head will be considerably prolonged.

The object of the present invention is to overcome the above mentioneddifficulties and to enable a front end portion of a hand held rock drillto be mounted in a new and improved manner.

Another object of the invention is to pro duce an improved connectionbetween a front end portion of a hand held rock drill and the mountingtherefor.

Further objects of the invention will hereinafter appear and theinvention is shown in one of its preferred forms in the accompanyingdrawings, in which Figure 1 is aside elevational view of a mounted rockdrill of the hand held type, some of the parts being broken away,

Figure 2 is a transverse sectional view taken on the line 22 of Figure1, looking 'in the direction of the arrows, and

Figure 3 is a perspective view of the front head of a rock drill shownin Figures 1 and 2.

Referring to the drawings, A. designates a shell which is formed withinternal guide ways B in which the guides C of a cradle D are adapted toextend. The shell A is preferably formed with a cone E to enable theshell to be swivelly mounted on a suitable support. A feed screw F is inengagement with the cradle D adjacent to the rearward end portion of thecradle and is secured to a plate G at one end of the shell A. The

plate G is preferably secured to a lug H on the shell A by the bolts Jand nuts K. The feed screw F may be provided with a suitable handle (notshown) to enable the cradle D to be moved back and forth in theguideways B of the shell A.

A lug L is in this instance formed in the cradle D and is preferablyformed with a V-shaped notch O which is adapted to receive the handle Pof a fluid actuated percussive machine Q, of the hand held type. Thefluid actuated percussive 'machine Q in this instance comprises acylinder or body portion R having .a back head S to which is connectedthe handle P by means of the spring pressed side bolts T. The front headU is also secured to the cylinder R by the spring pressed side bolts Tand is'adapted to receive the working implement V in this instance inthe form of a drill steel which is preferably held in the front head U"by the steel retainer WV. The steel retainer 7 is in this instancepivotal'ly connected to the trunnions 3V carried 011 the opposite sides.of the front head U. A valve chest X is secured to the cylinder R bythe bolts Y and nuts Z and a suitable distributing valve is located inthe valve chest for "distributing the .motive fluid to a hammer piston awhich is adapted .to reciprocate in the cylinder R for delivering impactblows to the drill steel V.

In accordance with the present invention, the front head U is preferablyformed with an integral T-shaped projection Z) at one side of itsforward end. The T-shaped projection b is adapted to extend into theguideway 6 of the cradle D and have limited longitudinal movementtherein, but is prevented from moving in a vertical plane by theguide-ways c. lVhen it is desired to use the rock drill Q for drillinghorizontal holes close to the ground,'the machine may be removed fromthe cradle D and the T- shaped projection I) will support the machine inthis position and prevent wear from occuring on the steel retainer lV orother front end parts of the machine.

In order to hold the handle P in the V-shaped notch O, a clamping plate7 is adapted to bear against the handle P and a bolt 9 extends throughthe plate and lag L and a coil spring It is preferably located betweenthe lug L and a nut which is screwed onto the end of the bolt g. In thismanner, whenever the piston a strikes against the front head U the forceof the blow will be absorbed by the coil spring 7t and the rock drill Qwill be permitted to move "longitudinally for a slightdistance.

tion of a front end portion of the machine,

means formed integrally with said front end portion for supporting saidPOIf/IOII, a

carriage on which said machine is mounted, said carriage being for-medwith guide-ways adapted to receive said integrally formed means and topermit said front end portion to slide in the longitudinal plane of themachine butprevent movement "in the vertical plane of the machine, meansfor clamping a rear end portion of the "machine to said parriage adaptedto permit limited longitudinal movement of the machine relative to saidcarriage, and a shell on which saidcarria-ge is mounted. V

2. A mounting fora fluid actuated percussive machine comprising thecombination of the front head of the machine, a carriage for saidmachine having guideavays, a clamp for a rear end portion of the machineadapted to permit limited longitudinal movement of the machine relativeto said carriage, and a 'T-shaped projection provided on one side of thefront head adapted to extend into the guide-ways of said carriage,whereby the front head is permitted to move in the longitudinal plane ofthe machine but is prevented from moving in the vertical plane of themachine.

3. A. mounting for a :fiuid actuated per cussive machine comprising thecombination of the front head of the machine, a carriage for saidmachine, cooperative aretaining means formed on said front head andcarriage adapted to permit movement of said front head relative 'to saidcarriage in the longitudinal plane of the machine but prevent movementin the vertical plane of the machine, means for clamping a rear endportion of the machine to said carriage adapted to permit a limitedlongitudinal movement of the machine relative .to said carriage, a shellfor said carriage,.and means for moving said carriage relative :toiSZlld shell.

In testimony whereof I have signed this specification.

RUSSELL H. WILHELM.

